Hey Lg2425,
Thanks for using Apple Support Communities! If we understand, you're wanting to use the Myzone app with your Apple Watch to record health information, but using both causes the first to not record. We can help with this. The first step is to ensure that your Apple Watch and paired iPhone are fully updated with their software and apps.
Update your iPhone, iPad, or iPod touch
Update apps or use automatic downloads
Update your Apple Watch
Once your devices and apps are updated, make sure the app is connected with the Health app. Here's a great guide for managing your Health data: Manage Health data on your iPhone, iPod touch, or Apple Watch
We also found a great resource from the Myzone support site that may be helpful: How to connect Myzone App with Apple Health
We hope this information helps!
Take care.